Diodes Incorporated DFLZ36Q-7

Overview

DFLZ36Q-7 from Diodes Incorporated is a 1.0W surface-mount power Zener diode in PowerDI123 package, rated for 36V nominal Zener voltage (34–38V range) at 1mA test current, with 40Ω maximum Zener impedance and ±0.06%/°C temperature coefficient. It delivers stable voltage regulation in automotive power supply rails and industrial overvoltage protection circuits.

For engineers reviewing the DFLZ36Q-7 datasheet, DFLZ36Q-7 pinout, DFLZ36Q-7 application, or DFLZ36Q-7 equivalent, key selection criteria include its AEC-Q101 qualification, 110°C/W thermal resistance (junction-to-ambient), 9°C/W junction-to-solder-point thermal resistance, and 1.2V forward voltage at 200mA - critical for reverse-bias clamping and precision reference designs.

Technical Context

This Zener diode operates in reverse breakdown to maintain a stable reference voltage under varying load and temperature conditions. Its patented interlocking clip design enables high-surge capacity per US Patent #7,095,113, and the exposed cathode pad enhances thermal dissipation on FR-4 PCBs.

The device is qualified to AEC-Q101 standards, features halogen- and antimony-free "Green" molding compound (UL 94V-0), and uses matte tin annealed over copper leadframe for reliable solderability per MIL-STD-202, Method 208.

Key Specifications

Pinout & Package

Package: PowerDI123 - molded plastic case with large exposed cathode pad for thermal management; UL 94V-0 rated; moisture sensitivity level 1 per J-STD-020; weight ≈ 0.01g.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener regulation applications.

Compared with BZX84-C36LT1G and 1N4738A, DFLZ36Q-7 uniquely combines AEC-Q101 qualification, PowerDI123 thermal performance (9°C/W R_θJS), and 40Ω Z_ZT in a surface-mount package - enabling robust, high-density, automotive-grade voltage clamping without derating.

Availability

DFLZ36Q-7 is available at Aetrix Electronics and suitable for automotive power systems, industrial 36V DC rails, telecom line card protection, and medical equipment power monitoring requiring stable component supply and long-term lifecycle assurance.

Supply support for DFLZ36Q-7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal devices, with manufacturing and testing facilities across Asia and North America.

The DFLZ series belongs to Diodes' AEC-Q101-qualified Power Zener portfolio, engineered specifically for high-reliability voltage regulation and transient suppression in automotive and industrial power systems.

FAQ

What is the maximum surge current DFLZ36Q-7 can handle?

DFLZ36Q-7 supports high-surge capacity enabled by its patented interlocking clip design (US Patent #7,095,113). While the datasheet does not specify a single peak surge current value, it is validated for automotive load-dump transients per ISO 7637-2 Pulse 5a, which imposes 120V/100ms pulses. Its thermal design and clip structure allow safe dissipation of such events when mounted on a 1"×1" 2oz copper pad.

Is DFLZ36Q-7 suitable for use in a feedback network of a switching regulator?

Yes - DFLZ36Q-7 is appropriate for feedback reference in non-isolated buck or boost regulators where 36V output is required. Its 40Ω Zener impedance and ±0.06%/°C temperature coefficient ensure stable regulation across temperature, and its 1µA leakage at 27V minimizes error in high-impedance divider networks. However, for precision feedback, verify stability with actual loop compensation.

Does DFLZ36Q-7 require a heatsink for 1W operation?

No external heatsink is required. When mounted on a 1.5"×1.5" FR-4 PCB with a 1"×1" 2oz copper pad connected to the exposed cathode, DFLZ36Q-7 achieves 110°C/W R_θJA and 9°C/W R_θJS, enabling full 1W dissipation at +25°C ambient. Derating is necessary above +25°C per Figure 1's power derating curve - e.g., ~0.7W at +70°C ambient.

How does the marking code 'FJS' correspond to DFLZ36Q-7?

The top-marking 'FJS' is the unique product type code assigned to DFLZ36Q-7 per Diodes' marking table. It appears laser-etched on the device surface alongside a two-character date code (e.g., 'J9' for September 2021). This marking enables traceability and verification of authenticity against Diodes' official package outline and marking documentation (DS36898 Rev. 3).